We are in store for a chilly week! An upper-level low remains parked off the coast of Western Washington, spinning sporadic and isolated snow showers into the mountains. Light low-level east flow and Fraser outflow will keep temperatures cool as mid-elevation high temperatures max out in the teens with light to moderate east winds at ridge tops, Mount Hood excepted. Skies will stay generally cloudy, with perhaps a few breaks here and there. Snow accumulations will be hit or miss, though generally distributed across both the east and west slopes of the mountains. Even the most favored locations aren’t likely to eek out more than an inch or three of low-density fluff. Showery activity decreases and further isolates overnight into Tuesday as the trough continues to dive to the south and west, bringing most, but all showery activity with it. Temperatures remain low on Tuesday with a further decrease in showery activity and maybe even some clearing skies in the mountains.
Weather Forecast
Olympics
West North
West Central
West South
Stevens Pass
Snoqualmie Pass
East North
East Central
East South
Mt. Hood
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Monday
Mostly cloudy with sporadic snow showers. Light to moderate ridgeline winds.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Light ridgeline winds increasing to light to moderate in the afternoon.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
Monday
Mostly cloudy with sporadic and light snow showers. Moderate ridgeline winds.
Monday
Night
Cloudy with light and scattered snow showers in the evening, decreasing and further isolating overnight. Light to moderate ridgeline winds.
The NWAC program is administered by the USDA-Forest Service and operates from the National Weather Service Forecast Office in Seattle. NWAC services are made possible by important collaboration and support from a wide variety of federal, state and private cooperators.
The 5000’ temperature forecast does not imply a trend over the 12 hr period and only represents the max and min temperatures within a 12 hr period in the zone. The 6-hr snow level forecast, the forecast discussion, and weather forecast sections may add detail regarding temperature trends.
The snow level forecast represents the general snow level over a 6 hr time period. Freezing levels are forecast when precipitation is not expected.
*Easterly or offshore flow is highlighted with an asterisk when we expect relatively cool east winds in the major Cascade Passes. Easterly flow will often lead to temperature inversions and is a key variable for forecasting precipitation type in the Cascade Passes. Strong easterly flow events can affect terrain on a more regional scale.
Ridgeline winds are the average wind speed and direction over a 6 hr time period.
The wind forecast represents an elevation range instead of a single elevation slice. The elevation range overlaps with the near and above treeline elevation bands in the avalanche forecast and differs per zone.
Wind direction indicates the direction the wind originates or comes from on the 16-point compass rose.
Water Equivalent (WE) is the liquid water equivalent of all precipitation types; rain, snow, ice pellets, etc., forecast to the hundredth of an inch at specific locations. To use WE as a proxy for snowfall amounts, start with a snow to water ratio of 10:1 (10 inches of snow = 1 inch WE). Temperatures at or near freezing will generally have a lower ratio (heavy wet snow) and very cold temperatures can have a much higher ratio (dry fluffy snow).